Determinations were conducted on chemical properties of stem-flow from Pinus thunbergii, Liquidambar formosana and Cinnamomum camphora, pH value and organic matter content in soil at mixed forest in Zhoushan, Zhejiang province. The results indicate that pH of stemflows decreased, concentration of chemical element increased, compared with that of the precipitation, leading to lower pH in the soil around stem but limited within one meter away from the stem. The nutrient input by stemflow increased organic matter and mineral content in the soil around. Among tested tree species, P. thunbergii had the lowest pH and the highest element concentration of stemflow, lowest organic matter content in the soil around. The reason was that the litter of P. thunbergii is more difficult to be decomposed than that of the other two tree species.%分析了黑松阔叶林内黑松（Pinus thunbergii）、枫香树（Liquidambar formosana）和樟（Cinnamomum camphora）3树种的树干径流对表层土壤化学性质的影响。结果表明，相比大气降水，3树种的树干径流pH值均有所下降，化学元素浓度则有所提高，导致树干基部土壤pH值较低，但其影响主要局限在离树干90 cm范围之内；树干径流的养分输入增加了树干基部土壤的有机质和矿质养分含量；从树种看，黑松树干径流的 pH 值最低，化学元素浓度最高，但离树干不同距离土壤有机质含量均低于枫香树和樟，其原因是黑松的枯枝落叶比枫香树、樟不易分解，说明土壤养分更多地受枯枝落叶分解的影响。
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